Hi, A ROOT limit on the length of user commands makes it difficult to execute complicated expressions, as the appended example shows. Although my expression is longer than one wants to type, the TreeViewer easily generates the same expression using only a few of the "Expression" slots provided. And the TreeViewer-generated Draw command is then rejected by CINT for the same "User command too long". So I'm wondering how the TreeViewer can be useful for any but the shortest Draw commands. Why does there have to be a length limit for command strings? I'm using RH6.2 egcs1.1.2 with a recent CVS development release. Thanks. George ******************************************* * * * W E L C O M E to R O O T * * * * Version 3.03/07 25 July 2002 * * * * You are welcome to visit our Web site * * http://root.cern.ch * * * ******************************************* FreeType Engine v1.x used to render TrueType fonts. Compiled for linux with thread support. CINT/ROOT C/C++ Interpreter version 5.15.50, July 7 2002 Type ? for help. Commands must be C++ statements. Enclose multiple statements between { }. Note: File "iostream.h" already loaded Executing rootlogon.C Loading user dynamic libraries. root [0] TFile tf("tracksr.root"); root [1] tf.ls(); TFile** tracksr.root TFile* tracksr.root KEY: TTree stripnt;9 StripSR Tree KEY: TTree stripnt;8 StripSR Tree KEY: TTree planent;4 PlaneSR Tree KEY: TTree planent;3 PlaneSR Tree KEY: TTree tracknt;1 TrackSR Tree root [2] TTree *tnt = tf.Get("tracknt"); root [3] tnt->Draw("(uvzend[0]+uvzend[1])/sqrt(2.):(uvz[0]+uvz[1])/sqrt(2.)"); <TCanvas::MakeDefCanvas>: created default TCanvas with name c1 root [4] tnt->Draw("(uvzend[0]+uvzend[1])/sqrt(2.):(uvz[0]+uvz[1])/sqrt(2.)","uvz[2]>0. && uvz[2]<14.7 && uvzend[2]>0. && uvzend[2]<14.7 && sqrt((uvz[0]+uvz[1])/sqrt(2.)*(uvz[0]+uvz[1])/sqrt(2.)+(uvz[0]-uvz[1])/sqrt(2.)*(uvz[0]-uvz[1])/sqrt(2.))<4. && sqrt((uvzend[0]+uvzend[1])/sqrt(2.)*(uvzend[0]+uvzend[1])/sqrt(2.)+(uvzend[0]-uvzend[1])/sqrt(2.)*(uvzend[0]-uvzend[1])/sqrt(2.))<4.","", 5104, 0); !!! User command too long !!! root [5] .q
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